Which type of reimbursement methodology is associated with the abbreviation “PMPM”

Which type of reimbursement methodology is associated with the abbreviation “PMPM”? In the healthcare industry, what is another term for “fee”? In the accounting system of the physician’s office, the account is categorized as “self-pay.” How should the insurance analyst interpret this category? The bill that the pathologist’s office submitted for a laboratory test was $54.00. In its payment notice (remittance advice), the healthcare plan lists its payment for the laboratory test as $28.00. What does the amount of $54.00 represent?